Electrochemical Preparation of VPtCl6 Film and Its Electrocatalytic Properties with NAD + and Sulfur Oxoanions

Abstract

A modified electrode with vanadium hexachloroplatinate film has been fabricated directly from the mixing of and ions, and its electrochemical behavior was investigated. The deposition of a film occurred when was electrochemically reduced to and to . The electrochemical quartz crystal microbalance (EQCM), ultraviolet-visible absorption spectroscopy, stopped-flow, chronoamperometry, and cyclic voltammetry techniques were used to study the deposition and growth mechanism of the above film. In the EQCM studies, the reversibility of the vanadium (II/III) hexachloroplatinate film during cycling and the corresponding frequency change was found to be good, and the ion exchange obviously occurred in the redox couple. For the surface morphological analysis, the film was further electrochemically deposited on a transparent semiconductor indium tin oxide (ITO) electrode for scanning electron microscopy and atomic force microscopy studies. It was found that the deposited film formed as a film with platinum and vanadium particles on ITO. To validate the electroanalytical properties, a -modified glassy carbon electrode was applied for the electrocatalytic reduction of the (β-Nicotinamide adenine dinucleotide) and sulfur oxoanions, and the results showed a quite effective electrocatalytic reduction for the corresponding substances.